Exactly! I'm not sure where the idea came from that you will need to put a precise amount of torque on the wheel during the turn itself (as
@boonedocks predicts). I don't wonder at all. I think that's exactly how it will happen.
I guess it's possible they could be using the internal camera as an attentiveness check, but I doubt it.
I do suspect that FSD users will have to enable the internal camera, even if it isn't actively being used for attentiveness checking, rather for training purposes, and then eventually for attentiveness.
Segueing back to the liability question: until the laws and regulations catch up with autonomous driving, even a fully autonomous privately owned vehicle is still going to be the responsibility of the vehicle owner, regardless of who is insuring it. This will require some kind of statement/signoff that the user of the vehicle is paying attention and enforcing it (through active monitoring of sign kind) in a way that will satisfy regulators. Maybe it's camera based, maybe it's steering wheel based, but there will certainly be some kind of monitoring.
We will not see an end to that until the day that the state the vehicle is being driven in enacts legislation that specifically regulates autonomous vehicles and defines exactly where the liability lies when the vehicle is being operated in autonomous mode--and I believe that will be transferred to the provider of the autonomous system, although yes, with exceptions for mechanical faults and acts of God (tire blowouts was the example given). But to be clear, this is just speculation on my part. Nobody knows at this point exactly how it will play out.
I also think it will be many many years before it does play out, regardless of how complete this FSD rewrite is. So I would not be holding my breath on this one.